1// SPDX-License-Identifier: GPL-2.0-only 2// Copyright (c) 2020 Facebook Inc. 3 4#include <linux/debugfs.h> 5#include <linux/netdevice.h> 6#include <linux/slab.h> 7#include <net/udp_tunnel.h> 8 9#include "netdevsim.h" 10 11static int 12nsim_udp_tunnel_set_port(struct net_device *dev, unsigned int table, 13 unsigned int entry, struct udp_tunnel_info *ti) 14{ 15 struct netdevsim *ns = netdev_priv(dev); 16 int ret; 17 18 ret = -ns->udp_ports.inject_error; 19 ns->udp_ports.inject_error = 0; 20 21 if (ns->udp_ports.sleep) 22 msleep(ns->udp_ports.sleep); 23 24 if (!ret) { 25 if (ns->udp_ports.ports[table][entry]) { 26 WARN(1, "entry already in use\n"); 27 ret = -EBUSY; 28 } else { 29 ns->udp_ports.ports[table][entry] = 30 be16_to_cpu(ti->port) << 16 | ti->type; 31 } 32 } 33 34 netdev_info(dev, "set [%d, %d] type %d family %d port %d - %d\n", 35 table, entry, ti->type, ti->sa_family, ntohs(ti->port), 36 ret); 37 return ret; 38} 39 40static int 41nsim_udp_tunnel_unset_port(struct net_device *dev, unsigned int table, 42 unsigned int entry, struct udp_tunnel_info *ti) 43{ 44 struct netdevsim *ns = netdev_priv(dev); 45 int ret; 46 47 ret = -ns->udp_ports.inject_error; 48 ns->udp_ports.inject_error = 0; 49 50 if (ns->udp_ports.sleep) 51 msleep(ns->udp_ports.sleep); 52 if (!ret) { 53 u32 val = be16_to_cpu(ti->port) << 16 | ti->type; 54 55 if (val == ns->udp_ports.ports[table][entry]) { 56 ns->udp_ports.ports[table][entry] = 0; 57 } else { 58 WARN(1, "entry not installed %x vs %x\n", 59 val, ns->udp_ports.ports[table][entry]); 60 ret = -ENOENT; 61 } 62 } 63 64 netdev_info(dev, "unset [%d, %d] type %d family %d port %d - %d\n", 65 table, entry, ti->type, ti->sa_family, ntohs(ti->port), 66 ret); 67 return ret; 68} 69 70static int 71nsim_udp_tunnel_sync_table(struct net_device *dev, unsigned int table) 72{ 73 struct netdevsim *ns = netdev_priv(dev); 74 struct udp_tunnel_info ti; 75 unsigned int i; 76 int ret; 77 78 ret = -ns->udp_ports.inject_error; 79 ns->udp_ports.inject_error = 0; 80 81 for (i = 0; i < NSIM_UDP_TUNNEL_N_PORTS; i++) { 82 udp_tunnel_nic_get_port(dev, table, i, &ti); 83 ns->udp_ports.ports[table][i] = 84 be16_to_cpu(ti.port) << 16 | ti.type; 85 } 86 87 return ret; 88} 89 90static const struct udp_tunnel_nic_info nsim_udp_tunnel_info = { 91 .set_port = nsim_udp_tunnel_set_port, 92 .unset_port = nsim_udp_tunnel_unset_port, 93 .sync_table = nsim_udp_tunnel_sync_table, 94 95 .tables = { 96 { 97 .n_entries = NSIM_UDP_TUNNEL_N_PORTS, 98 .tunnel_types = UDP_TUNNEL_TYPE_VXLAN, 99 }, 100 { 101 .n_entries = NSIM_UDP_TUNNEL_N_PORTS, 102 .tunnel_types = UDP_TUNNEL_TYPE_GENEVE | 103 UDP_TUNNEL_TYPE_VXLAN_GPE, 104 }, 105 }, 106}; 107 108static ssize_t 109nsim_udp_tunnels_info_reset_write(struct file *file, const char __user *data, 110 size_t count, loff_t *ppos) 111{ 112 struct net_device *dev = file->private_data; 113 struct netdevsim *ns = netdev_priv(dev); 114 115 memset(ns->udp_ports.ports, 0, sizeof(ns->udp_ports.__ports)); 116 rtnl_lock(); 117 udp_tunnel_nic_reset_ntf(dev); 118 rtnl_unlock(); 119 120 return count; 121} 122 123static const struct file_operations nsim_udp_tunnels_info_reset_fops = { 124 .open = simple_open, 125 .write = nsim_udp_tunnels_info_reset_write, 126 .llseek = generic_file_llseek, 127 .owner = THIS_MODULE, 128}; 129 130int nsim_udp_tunnels_info_create(struct nsim_dev *nsim_dev, 131 struct net_device *dev) 132{ 133 struct netdevsim *ns = netdev_priv(dev); 134 struct udp_tunnel_nic_info *info; 135 136 if (nsim_dev->udp_ports.shared && nsim_dev->udp_ports.open_only) { 137 dev_err(&nsim_dev->nsim_bus_dev->dev, 138 "shared can't be used in conjunction with open_only\n"); 139 return -EINVAL; 140 } 141 142 if (!nsim_dev->udp_ports.shared) 143 ns->udp_ports.ports = ns->udp_ports.__ports; 144 else 145 ns->udp_ports.ports = nsim_dev->udp_ports.__ports; 146 147 debugfs_create_u32("udp_ports_inject_error", 0600, 148 ns->nsim_dev_port->ddir, 149 &ns->udp_ports.inject_error); 150 151 ns->udp_ports.dfs_ports[0].array = ns->udp_ports.ports[0]; 152 ns->udp_ports.dfs_ports[0].n_elements = NSIM_UDP_TUNNEL_N_PORTS; 153 debugfs_create_u32_array("udp_ports_table0", 0400, 154 ns->nsim_dev_port->ddir, 155 &ns->udp_ports.dfs_ports[0]); 156 157 ns->udp_ports.dfs_ports[1].array = ns->udp_ports.ports[1]; 158 ns->udp_ports.dfs_ports[1].n_elements = NSIM_UDP_TUNNEL_N_PORTS; 159 debugfs_create_u32_array("udp_ports_table1", 0400, 160 ns->nsim_dev_port->ddir, 161 &ns->udp_ports.dfs_ports[1]); 162 163 debugfs_create_file("udp_ports_reset", 0200, ns->nsim_dev_port->ddir, 164 dev, &nsim_udp_tunnels_info_reset_fops); 165 166 /* Note: it's not normal to allocate the info struct like this! 167 * Drivers are expected to use a static const one, here we're testing. 168 */ 169 info = kmemdup(&nsim_udp_tunnel_info, sizeof(nsim_udp_tunnel_info), 170 GFP_KERNEL); 171 if (!info) 172 return -ENOMEM; 173 ns->udp_ports.sleep = nsim_dev->udp_ports.sleep; 174 175 if (nsim_dev->udp_ports.sync_all) { 176 info->set_port = NULL; 177 info->unset_port = NULL; 178 } else { 179 info->sync_table = NULL; 180 } 181 182 if (ns->udp_ports.sleep) 183 info->flags |= UDP_TUNNEL_NIC_INFO_MAY_SLEEP; 184 if (nsim_dev->udp_ports.open_only) 185 info->flags |= UDP_TUNNEL_NIC_INFO_OPEN_ONLY; 186 if (nsim_dev->udp_ports.ipv4_only) 187 info->flags |= UDP_TUNNEL_NIC_INFO_IPV4_ONLY; 188 if (nsim_dev->udp_ports.shared) 189 info->shared = &nsim_dev->udp_ports.utn_shared; 190 if (nsim_dev->udp_ports.static_iana_vxlan) 191 info->flags |= UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN; 192 193 dev->udp_tunnel_nic_info = info; 194 return 0; 195} 196 197void nsim_udp_tunnels_info_destroy(struct net_device *dev) 198{ 199 kfree(dev->udp_tunnel_nic_info); 200 dev->udp_tunnel_nic_info = NULL; 201} 202 203void nsim_udp_tunnels_debugfs_create(struct nsim_dev *nsim_dev) 204{ 205 debugfs_create_bool("udp_ports_sync_all", 0600, nsim_dev->ddir, 206 &nsim_dev->udp_ports.sync_all); 207 debugfs_create_bool("udp_ports_open_only", 0600, nsim_dev->ddir, 208 &nsim_dev->udp_ports.open_only); 209 debugfs_create_bool("udp_ports_ipv4_only", 0600, nsim_dev->ddir, 210 &nsim_dev->udp_ports.ipv4_only); 211 debugfs_create_bool("udp_ports_shared", 0600, nsim_dev->ddir, 212 &nsim_dev->udp_ports.shared); 213 debugfs_create_bool("udp_ports_static_iana_vxlan", 0600, nsim_dev->ddir, 214 &nsim_dev->udp_ports.static_iana_vxlan); 215 debugfs_create_u32("udp_ports_sleep", 0600, nsim_dev->ddir, 216 &nsim_dev->udp_ports.sleep); 217} 218